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Shannon Richardson is placed into a Titus County
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Shannon Richardson is placed into a Titus County Sheriff's car after an initial appearance at the federal building Texarkana, Texas. The FBI says Shannon Richardson admitted sending ricin-tainted letters to President Barack Obama and New York City Mayor Michael Bloomberg, but only after trying to pin it on her husband. (June 7, 2013)(Credit: AP / The Texarkana Gazette)

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Ricin scare hits lawmakers

Investigators probe packages sent to politicians in Washington, D.C. and other areas around the U.S. (April, 2013)